Portion of mask assembly



FIG. 1 is a front perspective view of a portion of a mask assemblyaccording to our design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof, with the right side view being amirror image thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

Throughout the various figures of the drawings, certain views may not beprovided. The omission of a particular view is intended to convey thatthe element(s) depicted is/are plain and unornamented in that omittedview, or that the particular ornamental appearance in the view is notclaimed.

Where included, broken lines showing environment or structure are forillustrative purposes only and form no part of the claimed design.

The ornamental appearance for a portion of mask assembly, as shown and described. 